The plastic diverter valves above are the best solution currently available for greywater diversion in 1.5 or 2" pipe. However, they are made of PVC, a bad plastic.

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Before clicking the "buy" button, make sure your system is designed to use as little resources as possible in its use and maintenance, including using as little plastic, as little bad plastic, and as few valves as possible.
The typical system uses at most three of these valves, one for the kitchen sink (yes, this this is legal only in Arizona so far, but the rules will catch up elsewhere before the house falls down), and one for the rest of the plumbing, and a one-inch brass valve from the laundry.
Why are we offering these if they are made of bad plastic? Well, they are the least of evils in many contexts that have conventional plumbing (which, in the West, is actually ABS, slightly better than PVC).
It is possible to make greywater valves of a better material (and a better design). If you or someone you know has a plastics manufacturing plant, please contact us for a design for better valves. The minute there is a more ecological valve, we'll drop these.
Also, consider that the whole idea of diverting greywater "elsewhere" is suspect. If it is too toxic to put on your garden, where exactly is it OK to put it? A more fundamental solution is to not buy anything that can't go on the garden, then put it all on the garden full time; no diverter valves.

The disease has been referred to as “beaver fever” because of a presumed link to those water-dwelling animals known to be carriers. However, it has been suggested that it is more likely that humans have carried the parasite into the wilderness and that beavers may actually be the victims.

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In particular, there is a growing amount of data showing that beavers living downstream from campgrounds have a high Giardia infection rate compared with a near-zero rate for beavers living in more remote areas.
In any case, beavers can and do contract giardiasis. Being water-dwellers, they are thus able to contaminate water more directly than an animal that defecates on the ground.
Other animals that can harbor Giardia are bighorn sheep, cats, cattle, coyotes, deer, dogs, elk, muskrats, pet rabbits, raccoons, and squirrels. But not horses and domestic sheep. And naturally occurring infections have not been found in most wild animals including badgers, bears, bobcats, ferrets, lynxes, marmots, moose, porcupines, rabbits, and skunks.
How many cysts does it take to get the disease? Theoretically only one, but volunteer studies have shown that 10 or so are required to have a reasonable probability of contracting giardiasis: About one-third of persons ingesting 10 – 25 cysts get detectable cysts in their stools.
However, most infected individuals have no symptoms at all! In one incident studied by the CDC, disruption in a major city’s water disinfection system allowed the entire population to consume water heavily contaminated with Giardia. Yet only 11 percent of the exposed population developed symptoms even though 46 percent had organisms in their stools. These figures suggest that (a) even when ingesting large amounts of the parasite, the chance of contracting giardiasis is less than 1 in 2, and (b) if you are one of the unlucky ones to contract it, the chance of having symptoms is less than 1 in 4. But perhaps the most telling statistic is that drinking heavily contaminated water resulted in symptoms of giardiasis in only 1 case in 9.

Oasis Design is a—quite possibly the—preeminent source of trustworthy source of greywater information since 1989.
Oasis Design has walked central, neutral ground between warring factions during sweeping changes in the emergent greywater industry. Our information and consulting clients entrust us with their darkest greywater secrets, system manufacturers keep us abreast of their offerings, academics appreciate our research. As we have become the world’s greywater “information central,” regulators increasingly seek us out for help directing policy and writing standards.

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We publish the most popular books on greywater; have developed numerous key greywater innovations and published them free and unpatented into the public domain, including #BeginLibraryItem "/Library/ZF-BranchedDrainGWbook.lbi" Branched Drain Grey Water Systems #EndLibraryItem and the #BeginLibraryItem "/Library/ZF-Laundry2land.lbi" Laundry to Landscape #EndLibraryItem system; developed the first plant and soil biocompatible laundry detergent; and helped develop better grey water policies and scientific understanding.
Since we don't sell any system, it's easy for us to be neutral about hardware. (We developed the world's first plant and soil biocompatible laundry detergent, but we sold that business in 1996.) Most contradictory information you'll find is from manufacturers with a stake in a particular system.
The quality and credibility of our information is the key to our livelihood; 95% of our income is from information.